With the Nexus 7 and Nexus 9 soon arriving in customers’ hands, developers need to update their apps for the new Android Lollipop. Since developers won’t be getting those devices earlier, Google has released a new developer preview for the Nexus 5 and Wifi Nexus 7.
This is not the final build of Android Lollipop, so if you are going to flash it to your device, do not expect it to run perfectly on your device. So unless you want to deal with bugs, avoid flashing this preview onto your main phone or tablet.
The final version will possibly be available on Wifi-only devices on November 5th, so if you have a Wifi-only Nexus 7, it would be easier to wait for the final version to be properly released. If you’re feeling brave though, go ahead and download the preview to flash your phone or tablet.